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- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.fo;
-
- import java.util.Iterator;
- import java.util.NoSuchElementException;
-
- /**
- * Kind of a super-iterator that iterates through children of an FONode,
- * in turn managing character iterators for each of them. Caveat: Because this
- * class is itself a CharIterator, and manages a collection of CharIterators, it
- * is easy to get confused.
- */
- public class RecursiveCharIterator extends AbstractCharIterator {
- /** parent node for whose children this iterator iterates */
- private FONode fobj;
- /** iterator for the child nodes */
- private Iterator childIter = null;
-
- /** current child object that is being managed by childIter*/
- private FONode curChild;
- /** CharIterator for curChild's characters */
- private CharIterator curCharIter = null;
-
- /**
- * Constructor which creates an iterator for all children
- * @param fobj FONode for which an iterator should be created
- */
- public RecursiveCharIterator(FObj fobj) {
- // Set up first child iterator
- this.fobj = fobj;
- this.childIter = fobj.getChildren();
- getNextCharIter();
- }
-
- /**
- * Constructor which creates an iterator for only some children
- * @param fobj FObj for which an iterator should be created
- * @param child FONode of the first child to include in iterator
- */
- public RecursiveCharIterator(FObj fobj, FONode child) {
- // Set up first child iterator
- this.fobj = fobj;
- this.childIter = fobj.getChildren(child);
- getNextCharIter();
- }
-
- /**
- * @return clone of this, cast as a CharIterator
- */
- public CharIterator mark() {
- return (CharIterator) this.clone();
- }
-
- /**
- * @return a clone of this
- */
- public Object clone() {
- RecursiveCharIterator ci = (RecursiveCharIterator) super.clone();
- ci.childIter = fobj.getChildren(ci.curChild);
- // Need to advance to the next child, else we get the same one!!!
- ci.childIter.next();
- ci.curCharIter = (CharIterator) curCharIter.clone();
- return ci;
- }
-
- /**
- * Replaces the current character in the CharIterator with a specified
- * character
- * @param c the character which should be used to replace the current
- * character
- */
- public void replaceChar(char c) {
- if (curCharIter != null) {
- curCharIter.replaceChar(c);
- }
- }
-
- /**
- * advances curChild to the next child in the collection, and curCharIter
- * to the CharIterator for that item, or sets them to null if the iterator
- * has no more items
- */
- private void getNextCharIter() {
- if (childIter != null && childIter.hasNext()) {
- this.curChild = (FONode) childIter.next();
- this.curCharIter = curChild.charIterator();
- } else {
- curChild = null;
- curCharIter = null;
- }
- }
-
- /**
- * @return true if there are more items in the CharIterator
- */
- public boolean hasNext() {
- while (curCharIter != null) {
- if (curCharIter.hasNext() == false) {
- getNextCharIter();
- } else {
- return true;
- }
- }
- return false;
- }
-
- /**
- * @see org.apache.fop.fo.CharIterator#nextChar()
- */
- public char nextChar() throws NoSuchElementException {
- if (curCharIter != null) {
- return curCharIter.nextChar();
- } else {
- throw new NoSuchElementException();
- }
- }
-
- /**
- * @see java.util.Iterator#remove
- */
- public void remove() {
- if (curCharIter != null) {
- curCharIter.remove();
- }
- }
- }
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